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Gunjac1-Visitor
1-Visitor
February 16, 2015
Question

Finding where graph intersect abscisa

  • February 16, 2015
  • 3 replies
  • 1305 views

Helo!

Please see attached file.

I have an piecewise linear function.

How can I program Marhcad to calculate where the graph intersects the abscisa?

For this case I have two values as you can see from the graph.

Please help

3 replies

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RichardJ19-Tanzanite
19-Tanzanite
February 16, 2015

That is the only value. The graph also appears to cross at 1, but that connecting line should really not be there. The function is discontinuous, and jumps from a positive value to a negative value.

G
Gunjac1-VisitorAuthor
1-Visitor
February 16, 2015

Yes thats correct, but how to detect this change in sign (+ --> - ) so that it also appears as a second solution?

Basicly at this point "graph" goes from +5 to -1

Maybe to change the piecewise linear function input somehow...but how?

R
RichardJ19-Tanzanite
19-Tanzanite
February 16, 2015

Well, then the second "solution" would be 1. You don't need to solve anything to get that though, because it's how you defined the function.

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